If I may humbly submit for your consideration:
http://www.nx7u.net/tetrode.html
Here you can download a Windows application that will do all the
"what-if" calculations for you. The URL gives an example analysis of a
4CX1000A, and the downloadable package has a few popular tetrodes ready
to go. You will have to "digitize" your own constant-current curves for
other Tetrodes, but it's really not too difficult. Instructions are
included. It's far from commercial grade, but it shouldn't be too
difficult to figure out.
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